Article
Engineering, Aerospace
Dengke Xu, Xu Dong, Chenghua Zhou, Dakun Sun, Xingmin Gui, Xiaofeng Sun
Summary: This study investigates the effect of rotor axial blade loading distributions on compressor performance by designing and comparing three compressors with different blade loading arrangements. Through steady numerical simulations and stall inception prediction model, the model accuracy of the fore-loaded compressor is validated. The research also reveals that the fore-loaded compressor performs the worst at mass flow rates below design point.
AEROSPACE SCIENCE AND TECHNOLOGY
(2021)
Article
Mechanics
Fan Yang, Yanhui Wu, Zhiyang Chen, Stephen Spence, Bo Li
Summary: The study investigates the unsteadiness caused by tip leakage vortex breakdown and identifies the role of the back flow vortex in rotating instability. Experimental tests and numerical simulations reveal high-frequency and low-frequency unsteady flow structures.
Article
Engineering, Chemical
Yueheng Wang, Moru Song, Jiali Xin, Bo Yang
Summary: This paper investigates the dangerous phenomenon of rotating stalls in the designing and operating of axial flow compressors. The proper orthogonal decomposition (POD) method is used to understand critical characteristics of the stall-related structures, which cannot be observed by traditional analysis methods. Numerical simulations are conducted to obtain detailed unsteady flow fields during the stall process, and the POD method is then used to extract flow characteristics from the numerical results. The study finds that the POD method is effective in decomposing the flow characteristics during the stall process.
Article
Engineering, Aerospace
S. Rosa Taddei
Summary: The equations for an inviscid blade force component to model flow turning through real blade rows are combined with Euler equations, resulting in a modified set of unsteady 2D flow equations explicitly dependent on blade camberline geometry. The method can predict compressor performance and stall configurations accurately, with experimental results in line with previous experience. Predicted stall inception transients and stall propagation speed also align with previous findings.
AEROSPACE SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Aerospace
Jia Li, Xu Dong, Dakun Sun, Ruize Xu, Xiaofeng Sun
Summary: This study investigates the effects of Rotating Inlet Distortion (RID) on a two-stage axial compressor and proposes a casing treatment method to suppress stall precursors, enhancing compressor stability under distorted conditions. Experimental results show that the application of the casing treatment improves stall margin by 6% with minimal efficiency loss.
CHINESE JOURNAL OF AERONAUTICS
(2021)
Article
Engineering, Aerospace
Zeyuan Yang, Yadong Wu, Zhenliang Liu, Shaoqin Zhang, Xiaoyu Xi, Jie Tian, Hua Ouyang
Summary: In this paper, a detailed experiment was conducted in a low-pressure single-rotor compressor to investigate the evolution and propagation characteristics of rotating instability (RI) phenomenon. A new method was developed to determine the location and quantity of prestall disturbances and their relationship with the azimuthal mode order. The findings provide new insights into the mechanism of RI and describe the tip flow field when the RI mode orders are relatively high.
AEROSPACE SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Aerospace
Song Moru, Yang Bo, Wang Yueheng, Zhou Rui, Li Zixuan
Summary: In this paper, the detailed flowfield during the spike-type rotating stall is obtained through numerical simulation and dynamic mode decomposition. The study reveals three important flow structures in the tip region during the transition from near-stall to stable stall.
AEROSPACE SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Aerospace
Hefei Li, Qun Zheng, Bin Jiang
Summary: This study investigates the influence of rotor-stator axial clearance on compressor stall characteristics using numerical simulation and experimental verification. The results demonstrate that the spanwise distribution of flow capacity changes and the stall margin decreases with the increase in axial clearance, leading to different disturbance intensity during the stall process.
AEROSPACE SCIENCE AND TECHNOLOGY
(2023)
Article
Mechanics
Yanchao Guo, Limin Gao, Xiaochen Mao, Chi Ma, Guanzhong Ma
Summary: Counter-rotating axial compressor (CRAC) is a potential technology to improve the thrust-to-weight ratio of aero-engines, but its special aerodynamic layout usually leads to more pronounced flow unsteadiness. Understanding the unsteady flow features and mechanism in the CRAC is important for aerodynamic optimization design and flow control strategy organization.
Article
Engineering, Aerospace
Jichao Li, Yang Liu, Juan Du, Hongwu Zhang, Chaoqun Nie
Summary: Experimental investigation into tip air injection for extending stall margin in a multi-stage axial flow compressor reveals that injecting air only upstream from the first stage can lead to a 20% increase in stall margin improvement. Different levels of injection (micro, macro, and overlarge) affect the tip leakage flow and mainstream flow to varying degrees, influencing the stall margin improvement. However, overlarge injection can result in the second stage stalling first, affecting the working capability and stall margin extension in subsequent stages.
AEROSPACE SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Mechanical
Jia-Hui Cao, Zhi-Bo Yang, Hao-Qi Li, Guang-Rong Teng, Shao-Hua Tian, Wen-Bo Li, Xue-Feng Chen
Summary: This study proposes a method for frequency identification of rotating blades using a single blade tip timing (BTT) probe. By obtaining a Sampling-Aliasing Frequency (SAFE) map and identifying resonance centers, the natural frequency of the blades can be accurately extracted from a single BTT measurement.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Engineering, Electrical & Electronic
Zhenfang Fan, Hongkun Li, Hongwei Cao, Jiannan Dong
Summary: The impeller is a crucial part of a large-scale centrifugal compressor and its performance directly impacts the stability and safety of the compressor. The blade tip timing (BTT), a non-contact measurement technology, is widely used for monitoring the blade vibration of rotating impellers. This study proposes a novel method called rotation speed-based surge identification (RSSID) to analyze surge frequency and evaluate the running status of the compressor. The study also detects cracked blades by monitoring the natural frequency of the blade. The research findings have significant importance for monitoring the running status and diagnosing rotating blade faults in large-scale centrifugal compressors.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Engineering, Aerospace
Zhiyang Chen, Yanhui Wu, Guangyao An
Summary: This paper investigates the flow mechanism of rotating instability in a subsonic axial flow compressor rotor through experiments and simulations. It is found that rotating instability occurs at a narrow stable operating range, and the frequency of rotating instability decreases with the decrease of mass flow rate. The stronger tip leakage vortex and induced vortex near the pressure surface side of the neighboring blade lead to the oscillation of tip leakage flow and tip aerodynamic loading, resulting in rotating instability propagation.
AEROSPACE SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Aerospace
Di Guan, Dakun Sun, Ruize Xu, Daniel Bishop, Xiaofeng Sun, Siling Ni, Juan Du, Dan Zhao
Summary: Experimental investigations on dynamic stall phenomena in a single-stage axial compressor were conducted using aeroacoustic measurements, revealing that the compressor stall corresponds to a low-frequency intrinsic mode and an increase in the dominant acoustic modes during stall. Traditional signal analysis methods did not provide any warning precursors, while advanced signal processing techniques such as EMD and POD analysis showed precursors before stall. CW transform could give a 0.05 s warning precursor.
AEROSPACE SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Aerospace
Jia Li, Xu Dong, Dakun Sun, Yuqing Wang, Chunwang Geng, Xiaofeng Sun
Summary: This study investigates the effects of foam metal casing treatments on the stability and acoustic level of a low-speed axial flow compressor. The results show that casing treatment improves stall margin and reduces noise level without efficiency loss.
Article
Chemistry, Multidisciplinary
Przemyslaw Palasz, Radoslaw Przysowa
APPLIED SCIENCES-BASEL
(2019)
Article
Engineering, Aerospace
Bartosz Stanislaw Przybyla, Radoslaw Przysowa, Zbigniew Zapalowicz
AIRCRAFT ENGINEERING AND AEROSPACE TECHNOLOGY
(2020)
Editorial Material
Engineering, Aerospace
Radoslaw Przysowa
AIRCRAFT ENGINEERING AND AEROSPACE TECHNOLOGY
(2020)
Article
Energy & Fuels
Remigiusz Jasinski, Paula Kurzawska, Radoslaw Przysowa
Summary: This study quantified the PM emissions from a small turbofan fueled with biofuels, particularly ATJ and its blends with Jet A-1 fuel. The results showed that the ATJ 30% blend had the lowest PM emissions, with a significant decrease in the emission index. Burning alternative fuel blends reduced particle mass emissions and nucleation mechanism dominated the PM emission.
Article
Materials Science, Multidisciplinary
Andrzej Szczepankowski, Radoslaw Przysowa, Jerzy Perczynski, Artur Kulaszka
Summary: This article focuses on the in-service monitoring and testing of multi-layer coatings applied on gas turbine blades. Through a series of tests, it was found that most of the blades withstood the tests and produced results comparable to the reference blades, but some suffered intolerable damage.
Article
Energy & Fuels
Nicola Menga, Akhila Mothakani, Maria Grazia De Giorgi, Radoslaw Przysowa, Antonio Ficarella
Summary: In this study, a data-driven model based on artificial neural networks (ANN) and extreme learning machine (ELM) was used to estimate the performance degradation of micro turbojets. The impact of component degradation on both flight and sea level conditions was simulated, and the ELM algorithm showed high prediction accuracy even with a small number of sensors.
Article
Chemistry, Analytical
Maciej Delis, Sylwester Klysz, Radoslaw Przysowa
Summary: Oil sampling has been an effective method for diagnosing lubricated tribosystems, such as main-shaft bearings in gas turbines, for many years. However, interpreting wear debris analysis results can be challenging due to the complexity of power transmission systems and variations in test methods' sensitivity. In this study, oil samples from M601T turboprop engines were tested using optical emission spectrometry and analyzed with a correlative model. Customized alarm limits for iron were determined based on aluminum and zinc concentration levels. Two-way ANOVA analysis and post hoc tests revealed a strong correlation between iron and aluminum, as well as a weaker but statistically significant correlation between iron and zinc. Applying the model to evaluate a selected engine showed that deviations in iron concentration from established limits indicated accelerated wear before critical damage occurred. ANOVA provided a statistically proven correlation between dependent variable values and classifying factors, enabling the assessment of engine health.
Article
Engineering, Aerospace
Mario Leonardo Erario, Maria Grazia De Giorgi, Radoslaw Przysowa
Summary: This study develops a numerical model of a micro gas turbine for prediction and prognostics of engine performance. The model is compared with experimental data, and the observed difference is found to be less than 3% for key parameters.
Proceedings Paper
Engineering, Electrical & Electronic
R. Fernandez, G. Durana, G. Aldabaldetreku, R. Przysowa, I Garcia
Summary: In this experiment, the behavior of a turbomachine shaft was characterized by measuring blade tip clearance and converting it to shaft displacement, utilizing two optical displacement sensors and applying the full spectrum technique.
OPTICAL SENSORS 2021
(2021)
Article
Engineering, Aerospace
Edward Rokicki, Radoslaw Przysowa, Jerzy Kotkowski, Pawel Majewski
Summary: The paper explores the use of inductive sensors for measuring blade motion in high-temperature environments, demonstrating the sensor's suitability for blade health monitoring even without a dedicated cooling system. Testing on a prototype sensor showed consistent output signal levels even at temperatures up to 1100 degrees C, indicating potential for widespread application in aircraft engines.
Article
Engineering, Aerospace
Radoslaw Przysowa, Bartosz Gawron, Tomasz Bialecki, Anna Legowik, Jerzy Merkisz, Remigiusz Jasinski
Summary: This study compared the performance and gas emissions of different jet engines using blends of biocomponents and Jet A-1 fuel. The results showed that the impact on engine operating parameters was limited, with no significant decrease in aircraft performance or increase in fuel consumption. Increasing the content of biocomponents led to a noticeable rise in CO emissions but did not significantly worsen working conditions for ground personnel, indicating no contraindications against using the tested blends for fueling gas-turbine engines.
Article
Engineering, Aerospace
Dmytro Pavlenko, Yaroslav Dvirnyk, Radoslaw Przysowa
Summary: This paper analyzes the selection of propulsion systems for UAVs, introduces alternative materials and technologies for manufacturing compressor blades, and performs thermodynamic and structural analysis to meet lower manufacturing costs.
Article
Engineering, Aerospace
Olexandr Khustochka, Sergiy Yepifanov, Roman Zelenskyi, Radoslaw Przysowa
Article
Engineering, Aerospace
Yaroslav Dvirnyk, Dmytro Pavlenko, Radoslaw Przysowa